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Windows
Analysis Report
yZcecBUXN7.exe
Overview
General Information
Sample name: | yZcecBUXN7.exerenamed because original name is a hash value |
Original sample name: | 9cd48f0d93c28ae6559409de23414554.exe |
Analysis ID: | 1435169 |
MD5: | 9cd48f0d93c28ae6559409de23414554 |
SHA1: | a6a625d2dce72bf9f7deee747c95ed7f7cf36cd0 |
SHA256: | 3ed0095ee2de05e81ac2c954eb0df312d6b919d871b60ce4265acd266be09d3c |
Tags: | 32exe |
Infos: | |
Detection
FormBook
Score: | 100 |
Range: | 0 - 100 |
Whitelisted: | false |
Confidence: | 100% |
Signatures
Antivirus detection for URL or domain
Malicious sample detected (through community Yara rule)
Multi AV Scanner detection for domain / URL
Multi AV Scanner detection for submitted file
Yara detected AntiVM3
Yara detected FormBook
.NET source code references suspicious native API functions
Deletes itself after installation
Found direct / indirect Syscall (likely to bypass EDR)
Injects a PE file into a foreign processes
Machine Learning detection for sample
Maps a DLL or memory area into another process
Modifies the context of a thread in another process (thread injection)
Queues an APC in another process (thread injection)
Tries to harvest and steal browser information (history, passwords, etc)
Tries to steal Mail credentials (via file / registry access)
Uses netsh to modify the Windows network and firewall settings
Allocates memory with a write watch (potentially for evading sandboxes)
Binary contains a suspicious time stamp
Checks if the current process is being debugged
Contains functionality for execution timing, often used to detect debuggers
Contains functionality to access loader functionality (e.g. LdrGetProcedureAddress)
Contains functionality to call native functions
Contains functionality to detect virtual machines (SLDT)
Contains functionality to read the PEB
Contains long sleeps (>= 3 min)
Creates a process in suspended mode (likely to inject code)
Detected potential crypto function
Found a high number of Window / User specific system calls (may be a loop to detect user behavior)
Found inlined nop instructions (likely shell or obfuscated code)
Found large amount of non-executed APIs
Found potential string decryption / allocating functions
IP address seen in connection with other malware
May sleep (evasive loops) to hinder dynamic analysis
PE file contains executable resources (Code or Archives)
Queries the volume information (name, serial number etc) of a device
Sample execution stops while process was sleeping (likely an evasion)
Sample file is different than original file name gathered from version info
Uses 32bit PE files
Uses code obfuscation techniques (call, push, ret)
Yara signature match
Classification
- System is w10x64
- yZcecBUXN7.exe (PID: 6640 cmdline:
"C:\Users\ user\Deskt op\yZcecBU XN7.exe" MD5: 9CD48F0D93C28AE6559409DE23414554) - yZcecBUXN7.exe (PID: 6712 cmdline:
"C:\Users\ user\Deskt op\yZcecBU XN7.exe" MD5: 9CD48F0D93C28AE6559409DE23414554) - jBaxmaKIzqHZYEOPQcTTJTXx.exe (PID: 3688 cmdline:
"C:\Progra m Files (x 86)\DUKoqS pezAPdkEeQ LfXbQJktRy LdTGIcgkgD cRWuknrvtO sFOYoJLHQw vsoW\jBaxm aKIzqHZYEO PQcTTJTXx. exe" MD5: 32B8AD6ECA9094891E792631BAEA9717) - netsh.exe (PID: 6760 cmdline:
"C:\Window s\SysWOW64 \netsh.exe " MD5: 4E89A1A088BE715D6C946E55AB07C7DF) - jBaxmaKIzqHZYEOPQcTTJTXx.exe (PID: 916 cmdline:
"C:\Progra m Files (x 86)\DUKoqS pezAPdkEeQ LfXbQJktRy LdTGIcgkgD cRWuknrvtO sFOYoJLHQw vsoW\jBaxm aKIzqHZYEO PQcTTJTXx. exe" MD5: 32B8AD6ECA9094891E792631BAEA9717) - firefox.exe (PID: 3020 cmdline:
"C:\Progra m Files\Mo zilla Fire fox\Firefo x.exe" MD5: C86B1BE9ED6496FE0E0CBE73F81D8045)
- cleanup
Name | Description | Attribution | Blogpost URLs | Link |
---|---|---|---|---|
Formbook, Formbo | FormBook contains a unique crypter RunPE that has unique behavioral patterns subject to detection. It was initially called "Babushka Crypter" by Insidemalware. |
⊘No configs have been found
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
Click to see the 13 entries |
Source | Rule | Description | Author | Strings |
---|---|---|---|---|
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
MALWARE_Win_DLInjector02 | Detects downloader injector | ditekSHen |
| |
JoeSecurity_FormBook_1 | Yara detected FormBook | Joe Security | ||
Windows_Trojan_Formbook_1112e116 | unknown | unknown |
| |
Click to see the 5 entries |
⊘No Sigma rule has matched
⊘No Snort rule has matched
Click to jump to signature section
Show All Signature Results
AV Detection |
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Source: | Virustotal: | Perma Link | ||
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Source: | Virustotal: | Perma Link |
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Source: | Code function: | 4_2_00C1B710 |
Source: | Code function: | 4_2_00C09350 |
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